Improvement in steam-engine oscillating valves



@animi o 0 Magee@ 1 v3' v l v Want IMPROVEMENT IN STEAM-EG-INE OSCILLATIN G- VALVES.

fthe Schedule referred to in these Letters Patent and making parl: of the same.

To all whom it may concern Be itknown that I, A. TREW, of Union City, in the county of Randolph, and State of Indiana, have invented certain new and useful Improvements in Conical Osci1- lating Valves for. Steam-Engines; and I do hereby declare that the following is a full and exact description thereof, reference being had to the accompanying drawings, making a part .of this specification.

The nature of my invention relates to an improvement in conical oscillating valves for steam-engines, whereby the steam is admitted continuously from the steam-chest through an opening in the'end of the valve, thus obviating the diculty arising from the inequality of pressure within the valve, consequent upon allowing the steam to be exhausted and replenished at intervals.

Also, my invention further consists in providing setscrews, at either end of the valve, by means of which the same .may be adjusted to its proper place in the barrel, either to counteract the eects of wear, or ofthe expansioaof the valve by heat.

To enable others skilled in the art to make and use my invention, I will proceed to describe the same with reference to the drawings, in`which- Figure l is a longitudinal section, and

Figure 2 is a vertical cross-section of my improved valve.

Figure 3 represents the plate used to prevent the egress of steam through the opening that admits the supply-pipe from the steam-chest.

A represents a hollow conical valve, suspended in the barrel W, by means of the set-screw T and the shaft R, which latter passes through the packing-box G, and is provided witha crank, D, to which a straight rod from the eccentric'is attached, for moving the valve.

The supply-pipe U communicates with the steamchest, and is introduced into the valve, through the curvedslot S, shown by dotted lines.

Egress of steam through the slot S, is prevented by the plate E, which is fitted closely to the end of the valve, and is held in place by the pressure of the steam.

For convenience in introducing plate E, the cap, C of the valve may besecured in its place by screws.

The ports I I and J .I are designed to admit steam to the cylinder, and Y K K is the escape, or eduction-opening.

It will be observed that these openings are so arranged as to require the minimum of oscillation of the valve.

It has beenA found in practice that a valve of this description is expanded by the heated steam ,within it to a much greater degree than the surrounding barrel; consequently, when well iitted, it is liable to stick.

To obviate this diiiiculty, as also to provide for the wear of the valve, is the object of the set-screws L and T. l

These screws impinge upon the shaft R and the centre of the valve, at X, and aord a convenient means of adjusting the said valve to any required position.

Having thus fully described my said invention,

What I claim, and desire to secure by Letters Patent, is

In combination with the conical oscillating valve A, the supply-pipe U and plate E, when arranged and constructed substantially as herein set forth.

A. TREW.

Witnesses WM. P. DE BOLT, G. M. EsPY. 

